Abstract. In recent years mobile multi-hop wireless networks have received significant attention and one of the major research concerns in this area is topology control. While topology control problem in ad hoc networks is NP-complete, several heuristic and approximation based solutions have been presented. However, few efforts have focused on the issue of topology control with mobility. In this paper, we introduce a new topology control scheme in the presence of mobile nodes. The proposed scheme predicts future proximity of neighboring nodes and applies power control such that the network connectivity is maintained while reducing energy consumption. Simulation results show that the optimal power selection based on location prediction gives better performance in terms of energy and connectivity.

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This paper describes DLL (delay locked loop) with builtin DCC (duty cycle correction) capability using a newly proposed coded phase blending scheme. The proposed scheme dramatically improves the DCC range and also enhances the total DLL pefiormance. The DLL has been designed and fabricated within 1G-bit DDR (double data rate) synchronous DRAM using 0 . l l~m process and the measnrement data show that it has unlimited DCC range, faster tnm-on speed and smaller jitter compared with OUT previous work 111. (Keywords: DLI, DCC, phase blending and DDR SDRAM)